Chimney cap and ventilator



(No Model.) 2 Sheets-Sheet 1 W. EARLE.

CHIMNEY GAP AND VENTILATOR. No. 527,199. Patented 001;. 9, 1894.

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(No Model.) 2 Sheets-Sheet 2.

W. EARLE.

CHIMNEY GAP AND VBNTILATOR.

No. 527,199. Patented Oct. 9, 1894.

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UNITED STATES PATENT OFFICE.

WILLIAM EARLE, OF PHILADELPHIA, PENNSYLVANIA.

CHIMNEY CAP AND VENTlLATOR.

SPEGIFIGATION forming part of Letters Patent No. 527,199, dated obtober 9, 1894.

Application filed October 6,1893. Serial 110.487,!343- (No model.)

. To aZZ whom it may concern.-

and useful Improvement in Chimney Gaps. and Ventilators, of which the following is a specification.

My present invention is an improvement upon the chimney cap and ventilator invented by me and formingthe subject-matter of Letters Patent No. 405,698, dated June 25, 1889, and the object of my invention is to simplify, cheapen, and improve upon the construction described in the said Letters Patent.

In the accompanying drawings I show and herein I describe a good form of a convenient embodiment of my invention the particular subject-matter claimed as novel being hereinafter definitely specified.

In the drawings, Figure 1 is a central vertical sectional elevation of my improved chimney cap and ventilator. Fig. 2 is a top plan view of the same, the cap being supposed removed.' Fig. 3 is an under plan view of the ventilator wheel. Fig. 4 is a view in perspective of the supporting bar and its spindle. Fig. 5 is a view in perspective of a portion of the body of the structure and of one of the.

screws and nuts by which the supporting bar is maintained in position. Fig. 6 is a view in perspective of the graphite bushing of the ventilator wheel and the device by which it is supported in position.

In the drawings, A represents a cylindrical body or base-through which the device rests upon the chimney top, B the protecting cylinder, being a metal cylinder of greater diameter than the chimney and supported in position about the top of the base A, and O is aprotecting cap, being a conical cap of metal of about the diameter of the chimney and supported in position above the protecting cylinder.

(1 are angle irons, the lower extremities of which are secured to the base A, the intermediate po'rtions of which extend radially outward so as to be adapted to be secured to the protecting cylinder B for the support of the latter, and the upper extremities of which are turned inward so as tobe adapted to be secured to the cap 0 for the support of the latter.

D is a corrugated flange circumscribiug the base A and secured to it in any usual manner.

The parts so far described are of substantially the construction disclosed in my said former patent, to which reference is to be made for further description of said parts.

My present improvements relate to the devices which support the ventilator wheel and to the construction of said wheel.

E is the supporting bar, the same consisting of a bar of any preferred construction, of length equal to the internal diameter of the base, the extremities of which bar are provided with recesses e and overhanging flanges e.

e are screws extending inwardly through holes in diametrically opposite sides of the base, and equipped at their inner extremities with nuts 8 In the assembling of the parts, the screws 6 being supposed in position, the supporting bar is placed within the base and so disposed that its recesses e embrace the respective screws e and, when in this position, its flanges 6' rest upon the upper edge of the base. Upon the tightening up of the nuts e the said bar will be firmly secured in position. The central portion of the bar is provided with a lug e embodying a vertical aperture, through which the screw-threaded lower end of a vertical spindle F extends, said spindle being socured in any desired position of vertical adjustment by the manipulation of nuts ff mounted upon it and disposed respectively above and below said lug.

The ventilator wheel is composed of a central many-armed integral hub casting and of sheet-metal blades secured to the arms of said casting.

G is the hub casting referred to, the same consisting of a cylindrical body and of a series of arms radially projecting from its lower portion.

The radial arms referred to are each slightly inclined from one edge to the other.

g are the series of sheet metal blades, which, with the casting, complete the wheel, the same being mounted upon said arms and secured thereto by screws and nuts g fThecenter' of the hub casting is hollow, and contains a bushing g of graphite-or other material adapted to form a bearing which will not require lubrication. I prefer to mount the bushing within said hub casting in the manner shown in Figs. 1, 3 and 6,.in'which the ber of said teethbeing turned inward upon the extremities of the block of graphite to secure the latter in position within the tube, while the remainder of said teeth are bent outward to embrace the ends of the hub casting to securethe tube in position. The block of graphite embodies a recess adapted to receive the spindle F upon which the ventilator wheel is to beseated and with respect to which it is to rotate.

The advantages of my improved structure will be readily understood.

In ventilators of this type the connection between the ventilator Wheel and the base with respect to which said wheel rotates has heretofore been made, as shown in my former patent, by securing a spindle rigidly to the ventilator wheel and providing the supporting bar with a hub containing the graphite bushing. In such construction, however, the body of the ventilator wheel (and therefore its center of gravity) has been above its bearing in the stationary hub in the supportin g bar, and, said hub and the graphite bearing within the hub, have been necessarily of great length in order to secure the ventilator wheel against its tendency. to drop to one side or the other as it naturally tended to do by reason of its center of gravity being above its base.

In my improved construction in which the spindle is on the contrary secured to the supporting bar, while the hub and bushing form pose.

part of the ventilator wheel, the center of gravity of the ventilator wheel is at the base of the Wheel and below the point of said spindle on which the weight of the wheel rests, and therefore a short bearing, being in fact one which is about half the length of that heretofore necessary, is sufficient for the pur- This reduction in the amount of graphite employed constitutes agreat improvement from the standpoint of economy of material, as the graphite is a very expensive substance; The arms which project from the hub casting constitute the bases to which the sheet metal blades of'the wheel are secured and theprovision of said arms, as integral portions of a single casting, expedites by reason of the ease with which the blades can be secured to said arms, the manufacture of the wheels to such an extent that a workman can turn out nearly twice as many Wheels in a given time than heretofore. The construction heretofore resorted to in this connection has been to manu ally'secure to the central portion of the wheel a series of independent arms and to attach the blades to the-arms asan independent operation. In my improved construction however, the arms which are with the hub made as a single integral casting, and are all of one.

pattern, insure that the blades subsequently applied shall be properly disposed and equidistant, serve to reinforce the strength of said blades, and, by their lateral inclination as shown, secure to the blades when the latter are attached, the proper. spiral set necessary to their successful operation. and application of the supporting bar are such that said bar may be readily detached and applied. .This is a feature of especial value in the transportation of devices of this type from the manufacturer to the user, the devices being ordinarily cumbrous and very liable to damage in shipment. As will be understood, however, my improved device can be packed into very small compass, as, by removing the supporting .bar and ventilator wheel, the cap may be placed, apex down within the ventilator wheel chamber, its upwardly turn ed concave face serving to receive the ventilator wheel, which may be placed therein in inverted position. As thus arranged the device can be packed for transportation in a comparatively small box and the parts will be little liable to damage. 7. Having thus. described, my invention, I claim- 1. In a chimney ventilator,in combination, a base, a supporting bar, an upwardly projecting spindle adjustably secured to said bar, and a ventilator wheel mounted on said spindle, substantially as set forth.

2. In a chimney ventilator, in combination, a base, a supporting bar removably attached thereto, an upwardly projecting spindle secured to said bar, and a ventilator wheel consisting of a hub having integral outwardly extending arms or bars which serve as the supports for blades attached thereto, said hub embodying a recess by which it is seated upon said spindle, substantially as set forth.

3. In a chimney ventilator,in combination with the base, projections mounted in said The form base, a supporting bar having recesses 

